本文介绍了如何翻译列表<字符串>为 Sql In 语句转换为 SqlParameter?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我似乎对如何使用 SqlParameter 执行 In 语句感到困惑.到目前为止，我有以下代码:
I seem to be confused on how to perform an In statement with a SqlParameter. So far I have the following code:
cmd.CommandText = "Select dscr from system_settings where setting in @settings";
cmd.Connection = conn;
cmd.Parameters.Add(new SqlParameter("@settings", settingList));
reader = cmd.ExecuteReader();
settingsList 是一个 List.当调用 cmd.ExecuteReader() 时，由于无法将 List 映射到已知提供者类型".
settingsList is a List<string>. When cmd.ExecuteReader() is called, I get an ArgumentException due to not being able to map a List<string> to "a known provider type".
我如何(安全地)使用 SqlCommands 执行 In 查询?
How do I (safely) perform an In query with SqlCommands?
推荐答案
你可以试试这样的:
string sql = "SELECT dscr FROM system_settings WHERE setting IN ({0})";
string[] paramArray = settingList.Select((x, i) => "@settings" + i).ToArray();
cmd.CommandText = string.Format(sql, string.Join(",", paramArray));
for (int i = 0; i < settingList.Count; ++i)
{
cmd.Parameters.Add(new SqlParameter("@settings" + i, settingList[i]));
}
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